Quatech DSCLP-100 Address Map and Special Registers, Base Address and Interrupt Level IRQ

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4 Address Map and Special Registers

This chapter explains how the two UARTs and special registers are addressed, as well as the layout of those registers. This material will be of interest to programmers writing driver software for the DSCLP-100.

4.1 Base Address and Interrupt Level (IRQ)

The base address and IRQ used by the DSCLP-100 are determined by the BIOS or operating system. Each serial port uses 8 consecutive I/O locations. The two ports reside in a single block of I/O space in eight byte increments, for a total of 16 contiguous bytes, as shown in Figure 5.

Port

I/O Address Range

 

 

 

 

Serial 1

Base Address + 0

to

Base Address + 7

 

 

 

 

Serial 2

Base Address + 8

to

Base Address + 15

 

 

 

 

Figure 6 --- Port Address Map

All two serial ports share the same IRQ. The DSCLP-100 signals a hardware interrupt when any port requires service. The interrupt signal is maintained until no port requires service. Interrupts are level-sensitive on the PCI bus.

The base address and IRQ are automatically detected by the device drivers Quatech supplies for various operating systems. For cases where no device driver is available, such as for operation under DOS, Quatech supplies the "QTPCI" DOS software utility for manually determining the resources used. See page 0 for details.

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DSCLP/SSCLP-100 User's Manual

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Contents DSCLP/SSCLP-100 Page Date of Purchase Model Number Declaration of Conformity Table of Contents General Information Force High-Speed Uart Clock X2 or X4, J4-J5 Hardware ConfigurationFactory Default Configuration Enable Scratchpad Register SPAD, J2Clock multiplier jumper options Jumper/connector locations Hardware InstallationThis page intentionally blank Base Address and Interrupt Level IRQ Address Map and Special RegistersInterrupt Status Register Enabling the Special RegistersEnhanced Serial Adapter Identification Options RegisterRR1 RR0 Clock Rate MultiplierWindows Millennium Windows ConfigurationsWindows Windows Windows Using the New Hardware Found Wizard Viewing Resources with Device Manager Page Page Page DOS and other operating systems Other Operating SystemsWindows NT OS/2QTPCI.EXE Basic Mode display QTPCI.EXE Expert Mode display External Connections RS-232 Port Signal INTA# PCI Resource MapICL3245CA SpecificationsPage Computer will not boot up TroubleshootingSSCLP/DSCLP-100
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